1251341321 has 8 divisors (see below), whose sum is σ = 1336676904. Its totient is φ = 1167308800.

The previous prime is 1251341309. The next prime is 1251341327. The reversal of 1251341321 is 1231431521.

It can be written as a sum of positive squares in 4 ways, for example, as 9765625 + 1241575696 = 3125^2 + 35236^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1251341321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1251341327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323780 + ... + 327621.

It is an arithmetic number, because the mean of its divisors is an integer number (167084613).

Almost surely, 2^1251341321 is an apocalyptic number.

It is an amenable number.

1251341321 is a deficient number, since it is larger than the sum of its proper divisors (85335583).

1251341321 is a wasteful number, since it uses less digits than its factorization.

1251341321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651531.

The product of its digits is 720, while the sum is 23.

The square root of 1251341321 is about 35374.3031168107. The cubic root of 1251341321 is about 1077.6025124123.

Adding to 1251341321 its reverse (1231431521), we get a palindrome (2482772842).

The spelling of 1251341321 in words is "one billion, two hundred fifty-one million, three hundred forty-one thousand, three hundred twenty-one".